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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56af1214542a3322c2cfc3688df6740e50d968c355500e56bb98c94f60a1737d' 
  AND token = '4+T2uDnypWe324naeQLudReyZes6zeqjPKWKWyo/4QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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