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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f714068a9c067609adf71a193f292675a41ab26ee0e0b6befd7e05fc337733bd' 
  AND token = 'eFpcrnMemUQr0D4B/oGbOR6CXislz5KPMCyKvEi31gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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