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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62e2bd9a7e7d2e58b8e0a2542aead56065e9bd0689553c6d8c21488f6d21eb8f' 
  AND token = 'VP2XAbJJTasTRIkIadkvefIjsI42tkVI5DHZ55i/KbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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