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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f62f74406e5069773216a6b5ea905759a14d12fd0be4f00d8d0c7fe6bc09ece' 
  AND token = '1kBR6X4AEAaraR1fv7gL5owbk/RobKJaOMD6rYIIexE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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