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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '617623d9551c7d370f77f1064bcb70513ab770f2b0a5899bea87db897d5adad8' 
  AND token = 'sGc+xxsz+JCdLDH+NvbwyA2sQ9D+4CI0SiQnjGactDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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