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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4c15283fe77bfa2bcc2be786d14d617079af86179492446ee701fc2c5367406' 
  AND token = 'g9nR13UgDOzuADl8dVs24SNdyuI3qq0N0RQtT/tdWbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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