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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02676d38d662bddc525f8d06d774cdd802d3902239f89b1ab1903506c8165d75' 
  AND token = 'cZqNkQ3WX7iud19y1eU7xJeeI/Ya8inP0gZQMht1d5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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