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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e5a3b60da752522a3a1e0aaf518f103f9ca384c56464345b13edeec484b613d' 
  AND token = 'I2MjNChQMxQtJ6t/0bKQMDYF7DD94XYKuYLIDFtj210=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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