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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aebac53b4a954510bc056513179a27d9df26857b0978420ed9741e06d365af75' 
  AND token = 'N6oK1zxjn95MJSN+BDBPckrzkKCkkMvCqa1D+C/dbtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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