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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dec1ca73e420ecdf5bcb72ed073526fd6524b76be01af63eb679a45c5107bc69' 
  AND token = 'eUebNHizHCiy75KAEvMwxNktAMLw3hpIXXr1IT3dAIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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