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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '779d1ae19e311bcc165666f6cd758d5b79a28811a82453ecb00e6f84bd355b1f' 
  AND token = 'nkzkeDNXc0rnT5R/Imdr3y67p+qCQLQOQV8lsJuuQeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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