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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '752af49ad52e24713fe00cecbb47572d7c3851ea19b3e8fbcbc4e30efe330a4f' 
  AND token = 'wjKg0Q2UzJ9jrUe29scLeSLbZFQ6aT/9dNXXV+g/MIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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