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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '058d7e7252b522d39a879276d2651a1bc15fcbb8294335226292392fba85663b' 
  AND token = 'JJhfui0OY3vHwsLAZbjTffSdWacReAvTR8hLUZpHMnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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