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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fcadabd4bf6fa748cd93036baba47592b7bb2291804300a4e04e0e44debbeb7' 
  AND token = 'pVBKsn42pdH+Q74b/DPAsOm0uICGulF5j8uMtQ37nnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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