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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf53f0379c77bf129d649d43eb7a74ffb973bb3a9cf62423bb89e3650321fe94' 
  AND token = 'EPXXXAzJ6HzDoJwRs5oCMz2q50Od3ovbKcQpk+XiMFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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