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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e6db433f2a030d9a325b332ed26c5d4b9599c1ef2f12fab67a7502a2fc7e65c' 
  AND token = 'n8T6+rRWeb5x9mtmsemK53yVeyU208xGfr73O9FMGE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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