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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42dee619a48d6979c36114feac89fa3015e30e5579b85ef36c2c2e82147b383e' 
  AND token = 'cfPhpt6LWUYBEuI2fIplLrXjO+cZHRS9ILsS5nKM5EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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