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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '182ee2b7dfced291fa58a96ee1c9ecd93e8892c80cfc990c964750ac6e8bbde5' 
  AND token = 'Dwe7JSDFrGlZr0ih7je8EkwrNYnt733p0yZwwXQMfvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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