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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2dffd951fcd73dfa64fe1ebf36dab39249be0b76230ee5640456a2ebb81c7783' 
  AND token = '+syN4I919YvKFU/xi/TbaYQDeX4iimvIQFwfsmZ0b+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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