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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6365f2997c174394d371d65dfacd701e7c6944ade8c6ffef8a238e941a4c0a5' 
  AND token = '0bsT/9jk4stBwXiK48kzPDATBhnth+VRoX3lnotdBPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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