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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c057c1f6edab77a543d12b65beea61e7250f8fba51cd0a55e797bf5c91294715' 
  AND token = 'ZbkMz95u84syf9/xoeRym41ZIJ98BEm1m0/h1wLVi3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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