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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e60990bd6a259d350329a2e40f3e7100626e05115ae6294398b4cadc1831402' 
  AND token = 'jf1sNkxhqMvKcdISEUzgJH/iyeePsH7PHoWryWc/bFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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