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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c823dc92a2698b17a07c3e3f887f6ac953fdb77bc65c51d47cd3b1d12758577' 
  AND token = 'ejXrctbcZJ0UbJqwCtPyDIsa0zaLi218XxWwv6w47r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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