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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6ea94ae3fa2a8826c455035b603133159e43e2515374407db3dbeaf1eb08f00' 
  AND token = 'VeTwM0x5AnpXvy/uBnJeuWJziflLMigjIb+4ym8t1/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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