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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5eae23e3e2f6ef36719da71d29603a39a607dedd9f1f5d41ae5020cbeb012db2' 
  AND token = 'pX5neGpRUhdNhfV4Xih7580KaqvvG8QJnEcYUf7wnUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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