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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd2ed0a1bee0037d023beb3fb7097f33e4cb7857b2783d157465376aa1b4061d' 
  AND token = 'OoYFNei95WR9btxm+3LI3g6o9jFbqTcPPHrjksD0grw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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