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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebc93fd690a7e66aa9bcd782aa8e3ce0dd278dae9d35c62dda10b00a11efdb9b' 
  AND token = 'duaCZfLjK1oHCa7Nf87I2zsPVVvYiDgfIV2slTE8AFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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