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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c29b51f112b7a28c837bbba941b030386fa04bae3777705811a468170735ee8f' 
  AND token = '6IGAF28gekH8C0mnU0EjXUOzJ1Z2Sxipbj4mpnKNo3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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