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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b41f9a66c058aec04e68b0bccd68a5356905332bd642902fb9b0563b7a817c1' 
  AND token = '9pgCwFt0y+W7Vk1PKEeeiuDIAFxUIYGy7hVCUik21sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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