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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '073e538b6524daab5233c5d5a3cd61dfc26f6808063b2bd345a39426f7bc1217' 
  AND token = 'I39LPsgFErfoWODwbCO0r3PpBlZGF83d0AmJ/AJTUEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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