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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac1e98e5ec469fd20a88dd0e2c513ec16ef3da01b2131aa97180359756a7528f' 
  AND token = '//G+SZN9j3XCemi7shf8q2y4HNR3b+aDPomD7omEeJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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