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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e782531a782860666692e32ca5939e311f7541c96dda22de328823157646d49d' 
  AND token = 'MvQ49URbuwkfx/f4zd/7d24ZroIRnCVY18upYed5TC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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