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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fed80a909f81fa2cf1f6be24570dd5d05c3c1796c11debc90118366020d0352' 
  AND token = '3rh2DkgP7vfXj1fQkD5DUbg78BYuihJZX5D9mT4hNAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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