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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef53a6b3bb8595f0f17bca785e02a2a1b2a322b15606192d876b9efb9697abe7' 
  AND token = 'wnxbV9swPXhnQ4uePRRX7dvW1vl3nqxVgMHlYryiyxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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