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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d8beec21157070f2e2c62562c343fb4433b191ea98b816f477348b80e8238c2' 
  AND token = 'dm0YK4KFuyD5qk8t/6mzdA6TLpaFV8lNXGqsXkw3y90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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