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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b74c1eb74545eada03d41152310f94f4e39d613354c1d85fb6b0d319eaee8a38' 
  AND token = 'cSOMO9acdV8gceWgPcE3RHJoZaw3E2mPXQ+5HUib5mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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