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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '171cb342eb79ad3da89fc913672f757418ed48e3f826be7b8884efc252a6e544' 
  AND token = 'Mced4EkJQBVTHg0eSbCuKIk34VukKKUvA+F1aKzCJ14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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