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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aac62d292843ce1d4dea0e0639f365961a0a96a6a93c4c48a00cee2a30bd7c63' 
  AND token = 'drvUoJIwmf3CWEKy+tYdmIlkKPcl8kgy/Vxij/KNjQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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