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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cac1e7f23bb8610e7d0f393f913f4e2ef9c6cec3ae2da6d1fe172cd4b1e904f' 
  AND token = 'uKZTRovOgUUdwUeScmrA8yA6kf15Q2Qf/zgGp8QY7R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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