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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '657a0448edde9364bddfe6419d7d683780dd833b08c2b9eea15da83c07b16bb6' 
  AND token = 'vKoX8Yw4CMRwXS/N8ZHvXATKfMaRm/H+vw47gvWWogY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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