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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f716766c3a0e2ed6427be64f2a707694fa85d86ca3e1e0de1470f582f17d07e' 
  AND token = 'CTL0uf9dNL0mwvYqIxoiZAAAyI7DEPcsm7/hySM6vzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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