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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42c4b3538a18dc67b0faeb075ce4882b651f7ada53c08b90403e1c038b1354e7' 
  AND token = 'UdUtLh7e2mC7m4g5aBOoVZAfOx3lHY7SV/J0E+ysrMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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