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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e1e03913f9df0c3758c15cfa7f019e53efc799b85b7b448db596d0e8b69b55a' 
  AND token = '03aFxlLP0vf7G9trpZyzbZCOBeEWmtDTS9VBtmDqxaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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