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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b48f16b537c4895ce3941f75985b3d7735ecc82e0d1aa7ea3f7a27b629be12a1' 
  AND token = 'DQnJxx78el3Mfke85KQUENUBA9B20cCX0hcFtmDbx/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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