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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48f8032b3c10ed0b9fb5b1895eb3dafbede426efefe3a0f19897eea2d7d74b14' 
  AND token = 'xzvVe/YEn32VVU5jE17YMTpRIv9YDxWNq4nzUE4He5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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