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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '762764dc6a5846f02470cc9cecaaf635e02b63e872521f952a5dc2b1aec6ab17' 
  AND token = 'gbUH+ie6jfMnDS6yAvA+M/gdX4pN/3WeoCPdf28ajas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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