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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6144e077c053e8bb44ff6cb97e717029cf5d593238469a09b648c286d4e7f98' 
  AND token = 'I/mZI3UHHZHEvlcXsbmLWJhXvkAtXkH2NoLbwTaavk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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