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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2f8ebed5509ea001640213dde8ff66ab16d884759af1a18422cca8bdb915282' 
  AND token = 'pkSHqnXIhidpMdwuy136+OrOLlSFhvOlEPfOU9Q1ENk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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