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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85f7d79df4946f3b091ea13f1c44b70d9b821b09faf9786fc2c47bc2654e6f4a' 
  AND token = 'QdCcpltet/iu9XVtW36/LDZKYV4e2pnjyB3bixaAgj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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