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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2f943ba7b642640bf8d7eda581b32c5fb56fe71a54bdd9fafbbb0cc73acf8a9' 
  AND token = '7oxiQ2Tpt2U6FanHAjTu+V50CHDYPt29hZlUH0xiCnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}