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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b1b77dc5e4a8569ee06380e328d4ef4fde59132b33692eeb6017de1f816e115' 
  AND token = 'G3IHC7maUrs3tLAFHRI4qEetDLm4PV/EAj/c3BpqDLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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