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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b7b3fc316e6bd036278e795bb5c102c0dd65c5bcbb003d7551658d1313b3f37' 
  AND token = 'wF1+tciMVc4aNMebyhN/Y8ufUOP3BEvd09s9py9xPX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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