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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09d8af6510867ec233c99d26842c4016603162daffe8385615d0f4a2747634e3' 
  AND token = 'p/EtIdo6ILTdZrsPn92fE/FYzlW3pmv7iS7ejylE6/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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