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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a459a805883df8edaea0a56aa776c5a939c609c55eafa503eed12efd3fb04e09' 
  AND token = 'zrfdJ2J1rwB2yQCV9CemgNWcqkwGTkPQYKAN9QPMo3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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