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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00c3f0a088c2e4e674f103689709510a15ce908d85e77c2f8106c6b0f47a36d2' 
  AND token = '87Eng17I7esETuGrgIhC3hpJflVmgt+gp3kE/+4j1vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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