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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '398dc3bef50e99330f5431658545a38606df6ca83fdd31c4d759c35c6cfb61f9' 
  AND token = 'NraSxTnjZ3khOfD3ktEO9pbWIP4VfU7JOJPHmvxtbFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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